Hone truing device



Oct. 12, 1954 H. R. BILLETER HONE mums DEVICE Filed July 24, 1951ZZZbEYZZ OZ" Hezzg Foerzfizi/eier Patented Oct. 12, 1954 UNITED STATESPATENT OFFICE HGNE TRUING DEVICE Henry Robert Billeter, Highland Park,111., as-

signor to Ammcc Tools, Inc, Chicago, 111., a corporation of IllinoisApplication July 24,1951, Serial No. 238,315

8 Claims.

This invention relates to a hone truing device, and more particularly tosuch a device for truing the abrasive elements of rotatable hones of thetype utilized for honing cylindrical surfaces.

Cylindrical bones of the type mentioned commonly employ a drive shankand honing head, the honing head having a plurality of abrasive elementsthat are expandible and contractible in radial directions. The hone maybe mounted in various ways, such as in a machine which supports androtates it, and the work piece to be honed is applied to the hone whenso mounted. In the course of the use of the hone, the abrasive elementsbecome worn and must be periodically trued.

An object of the invention is the provision of an improved device fortruing the abrasive elements of rotatable hones of the type referred to.

Another object is the provision of a device for truing the abrasiveelements of a rotatable hone of the character above referred to, whichis adapted to be mounted on and. supported by the drive shank of thehone in the truing operation and thereby effective for truing theabrasive elements to a shape perfectly concentric with the axis of thedrive shank.

Another object is the provision of a device for truing the abrasiveelements of a rotatable hone of the character above referred to, havinga truing stone and adapted to be mounted on and supported by the driveshank of the hone in position wherein the truing stone is adjacent theabrasive elements, and which has elements engageable with the driveshank in such a manner as to be effective, upon manual pressure beingapplied to the device for retaining it on the bone, for positivelylimiting movement of the truing stone toward the abrasive elements.

A further object is the provision of a device for truing rotatable homesof the type having an elongated drive shank and a honing head withelongated abrasive elements therein, which when applied to the hone, issupported by the drive shank for movement back and forth along the driveshank in position for engaging the abrasive elements throughout thelength of the latter.

Still another object is the provision of a device of the characterreferred to above for truing the abrasive elements of rotatable house,which, being supported by the hone itself when applied thereto forperforming the truing operation, enables the truing operation to beperformed on the abrasive elements without the necessity of removing thehone from the machine in which it is mounted.

Another object is the provision of a device for truing the abrasiveelements of rotatable homes, which is of exceedingly simple character.

A further object is the provision of a device of the aforesaidcharacter, which is capable of being applied to a hone by a simplemanipulation, by merely hooking the device onto the hone and holding itin position by manual pressure.

A still further object is the provision of a hone truing device of thecharacter referred to, which contains a truing stone adjustably mountedtherein and means for fixedly securing the truing stone in any desiredadjusted position, within a predetermined range relative to the abrasiveelements of the hone on which it is mounted, whereby the desiredadjustment of the truing stone may be made according to the size of thehone or the adjusted position of the abrasive elements thereof, and theabrasive elements may thereafter be expanded toward and brought intoengagement with the truing stone for removing portions of the abrasiveelements to the depth necessary for eliminating irregularities of theabrasive elements so that the latter are shaped to a true, round andconcentric shape.

Other objects will appear from the following description taken inconjunction with the ac companying drawings. in which:

Figure l is a perspective view of the hone truing device applied to ahone mounted in a honing machine;

Fig. 2 is a perspective view of the truing device itself, with a smallportion broken away and shown in section, this figure being greatlyenlarged relative to the view of the device in Fig. 1;

Fig. 3 is a side view of the device applied to a hone; and

Fig. i is a view taken on line 6-4 of Fig. 3.

Referring in detail to the drawings, Fig. l. illustrates the hone truingdevice applied to a cylinder hone. The bone may be mounted in any of anumber of ways, it being shown herein as mounted in and supported by ahoning machine. The hone truing device 52 will be described in detaillater as to its details of construction and its use, but in order toprovide the desired background for reference to the use of the device, abrief general description of the honing machine and hone will be given.

The honing machine M may of course be of any desired type, such forexample as that disclosed in Mitchell Patent 2,483,590, issued October4:, 19459, and the hone it which is mounted in the honing machine, fortruing which the truing device is applied, is of the type for honinginternal surfaces of cylinders. The hone i6 includes an elongated driveshank l8 and a honing head 28, the latter having a plurality of abrasiveelements 22, sometimes referred to merely as stones, spacedcircumferentially of the honing head and extending longitudinallysubstantially throughout the length thereof. The abrasive elements 22extend radially outwardly of the honing head and have outer surfacesthat are arcuate in cross-sectional contour, forming portions of acylindrical surface. The hone It illustrated herein is of the typedisclosed and claimed in my copending application filed July 31, 1951,Serial No. 239,526. The hone of that application, as well as homes ofcertain other types, includes a centering cone 24 rotatably and slidablymounted on the drive shank l8, and a drive adapter 25 for mounting thehone in the honing machine. The construction and ar rangement is suchthat the drive adapter 25 rotates, which rotates the drive shank l8 andthe latter in turn rotates the honing head 20. The drive shank [8includes a push rod (not shown) which, upon axial movement thereof inone direction, expands the abrasive elements 22 radially outwardly. Thepush rod is actuated by certain devices within the honing machine [4which are not shown herein but reference is directed to theabove-mentioned Mitchell patent for the details thereof, The honingmachine is provided with a treadle (not shown) connected with a chain26, the latter being connected with a lever 28 for controlling theoperation of the honing machine. Depression of the treadle is effectivefor expanding the abrasive elements of the hone, while the dial 3!) iseffective for setting elements of the machine for determining theextentof expansion of the abrasive elements produced by depression ofthe treadle. When the treadle is held in depressed position, theabrasive elements may be expanded and contracted directly bymanipulation of the dial.

The truin device is made up of three simple main parts, namely, a rigidbody member 32, a truing stone 34 supported therein, and a handle 36which is utilized for the purpose of detachably securing the truingstone in the body member and providing a means for applying manualpressure to the device for maintaining it in proper position on the honeand sliding it back and forth along the hone.

The body member 32 is preferably an integral casting of aluminum alloy,but it may be made of any other desired material suitable for thepurpose. The body member includes an inclined web portion 49 extendinggenerally longitudinally of the body member and disposed to one sidethereof. Extending laterally from the web portion 40 are two jaws 42 and44 with their extended ends disconnected from each other, and spacedapart longitudinally along the body member a substantial distance, adistance greater than the diameter of the hone shank, for receiving theshank therebetween in applying the device to the hone in a manner to bereferred to later. The jaws 42 and 44 are provided with V-shaped notchesor concave surfaces 46 and 58 respectively, facing oppositely to eachother for engaging opposite sides of the hone shank, and spaced apart inthe direction of the diameter of the shank between said opposite sidessufiioiently that when they engage the shank, the device extendsgenerally longitudinally of the shank. The surfaces 46 and 48, althoughpreferably of V- shape, may be of other shapes so long as they areeffective for engaging the hone shank so as to center the device on thehone.

The body member 32 also includes a portion for mounting the truing stone34 and supporting the handle 33, which takes the form of an overhangingextension 5e which projects from the web portion ti} and the adjacentjaw (i in a direction longitudinally beyond the latter. The extension 50is at least as long as the honing head on any of the bones with whichthe device is to be used so that the truing stone will engage theabrasive members of the bone throughout their length when the device ismoved back and forth alon the shank of the hone, as will be referred tolater. The overhanging extension is substantially coextensive with thejaw 44 in transverse dimension and is preferably so disposed as toextend generally parallel with the longitudinal axis of the device as awhole. The extended end of the extension 50 is shaped to form a boss 52having a central aperture 5 disposed on an axis transverse to thelongitudinal axis of the device and radially with respect to the honewhen the device is applied thereto. The truing stone 34 is ofappropriate size and shape to fit in the aperture 58 and as here shownis cylindrical. The truing stone may be made of any desired material solong as it possesses the required hardness for producing an abrasiveaction on the abrasive elements or stones 22. The truing stone itselfmay therefore also be referred to as an abrasive element. In practice, avitrified dressing stick. composed of silicon carbide grain bondedtogether, is employed as a truing stone. The stone 34 is adjustablealong the axis of the aperture 59 and thereby adjustable transversely ofthe longitudinal axis of the device so as to be brought into the desiredproximity to the abrasive elements 22 in the hone. It will be noted thatthe stone 34 extends in the same direction as the nearer jaw 44, wherebythe stone is positively limited in movement toward the abrasive elementswhen the device is applied to the hone, as will be referred to later.

It is of course necessary that the truing stone when adjusted to thedesired position be rigidly secured in that position, and to this endthe handle member 38 is utilized for engaging and securing the stone inplace. The handle is provided with a reduced threaded end 55 forthreading into a tapped hole 58 in the boss 52 and engaging the stone34. Upon tightening the handle the inner end thereof engages the stoneand firm- 1y retains the latter in position.

In the use of the device the handle is grasped by the hand, and the bodymember held in a position with its longitudinal axis substantiallytransverse to the axis of the hone. When the hone is horizontallydisposed for example, as herein shown, the body member is held independing position, adjacent the vertical. The device is then movedtoward the drive shank I8 so that the latter is inserted between thejaws 42 and M after which the device is rocked to the position whereinthe notches or concave surfaces 46 and 48 of the jaws engage the driveshank IS on opposite sides thereof. The device may be applied to honeshaving shanks of various sizes by reason of the size and depth of thenotches in the jaws 42 and 44. If the device, when applied to a honehaving a given size shank, is disposed at an angle relative to the axisof the hone, any such angularity may be readily compensated for byadjusting the truing stone for moving it in the appropriate direction inthe aperture 54 for placing it in the desired proximity with theabrasive elements of the hone for performing the truing operation. Thedevice is easily maintained in centered position by downward pressure onthe handle 36 because the notches it and d8 engage the shank of the honeon opposite sides thereof at axially spaced points therealong. Thenotches in engaging the shank prevent lateral displacement of the devicesuch as by twisting. The threads on the reduced end 56 of the handle arepreferably right-hand threads so that the operator on applying downwardpressure on the handle creates a normal tendency to thread the handleinwardly in the tapped hole 58 and thereby lock the stone 34. When thedevice is thus in position on the hone, the lower end of the truingstone is in a position adjacent the honing head and the stone can beadjusted radially with respect to the honing head (vertically as shownin the drawings) for the purpose of moving it to the desired positionfor the truing operation.

In the use of the device, it is applied to the hone in the manner abovedescribed while the machine is shut off so that the hone is notrotating. Then the machine is set so that the abrasive elements 22 ofthe hone are adjusted to a position slightly outwardly from theirinnermost contracted position. Such an adjustment, as reference to theabove-mentioned Mitchell patent will show, is made by adjusting the dial30 to the desired position while the treadle of the machine isdepressed. The truing stone 34 is then adjusted downwardly so that itonly touches the abrasive elements 22. The stone is then clamped in theadjusted position by tightening the handle 36.

After the foregoing steps and with the treadle retained in depressedposition, the dial '30 is manipulated for fully retracting the abrasiveelements 22. The operator bears downwardly on the handle 35 to stablysupport the device on the hone, and with the device so held, the nextstep is to set the honing machine into operation for rotating the hone.Thereafter the dial 30 is manipulated for expanding the abrasiveelements 22 to a slight extent so that the abrasive elements are broughtinto position for engaging the truing stone upon rotation of the hone.The truing device is then moved back and forth along the drive shank I8at a slow rate for engaging the abrasive elements by the truing stonethroughout the full length of the abrasive elements. As noted above, theoverhanging extension 58 is at least as long as the honing head of thehone with which the device is to be used. This enables the truing stoneto fully reach the outer ends of the abrasive elements While the jawsare in engagement with the hone shank. For any given setting of thedial, the truing device is moved back and forth slowly and then the dialis again manipulated for slightly expanding the abrasive elements.

The operator continues expanding the abrasive elements and moving thetruing device back and forth after each expansion until he is assuredthat the truing stone contacts each of the abrasive elements throughoutits entire length and breadth. The abrasive elements after the operationdescribed above will be dressed to a true arcuate shape in cross sectionconcentric with the axis of the drive shank, and will be straight inlongitudinal direction.

The honing machine 4 usually also includes an oil circulating system fordirecting oil onto the honing head during honing operations and it isdesired also that oil be directed onto the honing head during the truingoperation. For this purpose the oil nozzle on the end of a flexibleconduit 52 of the oil circulating system is disposed so that the honingoil flowing therefrom is directed toward the honing head from the rearthereof for washing the grit from the abrasive elements and truing stoneaway from the shank.

The hone truing device of the present invention is especially effectivefor truing the abrasive elements of the hone to a shape perfectlyconcentric with the axis of the drive shank. This is made possible byvirtue of the fact that the truing device is mounted on and supported bythe drive shank itself. The concentricity of the abrasive elements withthe axis of the drive shank has special significance in the operation ofhoning spaced, axially aligned bearing bushings by the use of thecentering cone 2%. Such centering cone is utilized in connection withhoning piston pin bushings or other similarly aligned bushings.Reference is made to Zimmerman Patent 1,936,612, dated November 28,1933, disclosing a hone having such a centering cone and disclosing themethod of honing piston pin bearing bushings. In such operation, thepiston is applied to the hone in such a way that the honing head extendsthrough one of the bushings and into the other, and the centering coneis moved up to engage the adjacent bushing. The centering conecooperates with the honing head in maintaining the piston in properalignment with the axis of the drive shank of the hone, so that when thepiston is alternatively positioned for honing each of the two alignedbearing bushings,, the bushings will be honed perfectly concentric withthe intended alignment axis of the bushings.

The centering cone is of course concentric with the axis of the driveshank and it is of course desirable that the outer surfaces of theabrasive elements be also concentric with the axis of the drive shank toaccomplish the desired honing operation in the two aligned bearingbushings in the piston. The hone truing device of the present inventionaccomplishes such concentricity of the abrasive elements by reason ofthe fact that the device is supported directly by the drive shank. Theabrasive elements are of course rotated about the axis of the driveshank and since the truing device is supported by the drive shank thetruing device produces surfaces on the abrasive elements concentric withthe axis of the drive shank. The back and forth movement of the deviceon the shank assures that such concentricity of the abrasive elements isestablished throughout the length of the abrasive elements.

Another advantage of the device of the present invention is that thehone can be trued while it is mounted and supported in the honingmachine, eliminating the necessity for removing the hone from themachine for performing a truing operation. Since the hone itselfprovides the support for the truing device it is unnecessary to provideother and outside support for maintaining the truing device in properposition in the truing operation.

The device is exceedingly simple and inexpensive to make-it includesthree simple main parts, the body, the truing stone and the handle. Thetruing device may be applied to the hone by a simple manipulationsimilar to a simple hooking movement.

The device is retained firmly in centered position on the hone merely byapplying downward pressure on the handle 36. The presure applied merits.

to the handle by the operator produces such leverage that the jaws l2and M on opposite sides of the shank, and spaced axially therealong,grip the shank in such a way that the device is easily maintained instable position in the truing operation against the tendency of theabrasive elements of the hone to displace the device. As mentionedabove, the truing stone 34 extends in the same direction as the nearerjaw 44. By reason of this relationship the stone is positively limitedin movement toward the abrasive elements in response to manual pressureapplied to the device in maintaining it on the hone. Rotation of thehone, in the initial portion of the truing operation, may have atendency to cause the device to bounce i. e., throwing the truing stoneaway from the abrasive elements, but the pressure applied to the handlet6, being normally constant, causes the stone to be immediately returnedtoward the abrasive elements. However, the concave surface is inengaging the shank positively limits the movement of the truing stonetoward the abrasive elements to the position intended according to theamount of material to be removed from the abrasive ele- There istherefore no possibility of the truing stone being moved toward theabrasive elements to an extent greater than that intended, with theresult that an arcuate and true arouate shape is produced on theabrasive elements. As the abrasive elements gradually assume theirintended shape, any previously existing tendency of the abrasiveelements to cause bouncing of the device is gradually dissipated untilfinally the device is held solidly and positively in its limit positionfor accurately shaping the abrasive elements.

I claim:

1. A device for truing a hone comprising a body, a pair of jaws carriedby and projecting laterally from said body and having respectively,laterally concave, open and unobstructed, workengaging surfaces facingin opposite directions and inwardly toward an axis passing mediallyacross and between said jaws, said jaw faces being spaced longitudinallyalong and laterally from. said axis, an abrasive element, said bodyhaving a portion longitudinally beyond one of said jaws carrying andguiding said abrasive element for adjustment toward and away from saidaxis, and means carried by said body for securing said abrasive elementin adjusted position.

2. A device for truing a hone comprising a body, a pair of jaws carriedby and projecting laterally from said body and having respectively,laterally concave, open and unobstructed, workengaging surfaces facingin opposite directions and inwardly toward an axis passing mediallyacross and between said jaws, said jaw faces being spaced longitudinallyalong and laterally from said axis, an abrasive element, said bodyhaving a projecting portion longitudinally beyond one of said jawscarrying and guiding said abrasive element for adjustment toward andaway from said axis in a plane passing through said axis and mediallythrough said faces, and means carried by said projecting portion forsecuring said abrasive element in adjusted position.

3. A device for truing a hone comprising a body having a web element, apair of laws carried by and projecting laterally from said web elementand having respectively, laterally concave, open and unobstructed,work-engaging surfaces facing in opposite directions and in- \vardlytoward an axis passing medially across and between said jaws, said jawfaces being spaced longitudinally along and laterally from said axis, anabrasive element, said body having an extension projecting from said webelement longitudinally beyond one of said jaws carrying and guiding saidabrasive element for adjustment toward and away from said axis, meanscarried by said extension for securing said abrasive element in adjustedposition, and a handle projecting laterally from said extension.

4. A device for truing a bone comprising a body having a web element, apair of laws carried by and projecting laterally from said body andhaving respectively, laterally concave, open and unobstructed,work-engaging surfaces facing in opposite directions and inwardly towardan axis passing substantially parallel to said web portion and mediallyacross and between said jaws, said jaw faces being spaced longitudinallyalong and laterally from said axis, an abrasive element, said bodyhaving an extension substantially parallel to said am's, projecting fromsaid web portion longitudinally beyond one of said jaws carrying andguiding said abrasive element for adjustment toward and away from saidaxis, and means carried by said extension for securing said abrasiveelement in adjusted position.

5. A device for truing a hone comprising a body, a pair of jaws carriedby and projecting laterally from said body and having respectively,laterally concave, open and unobstructed, workengaging surfaces facingin opposite directions and inwardly toward an axis passing mediallyacross and between said jaws, said jaw faces being spaced longitudinallyalong and laterally from said axis, an abrasive element, said bodyhaving a portion longitudinally beyond one of said jaws carrying andguiding said abrasive element for adjustment toward and away from saidaxis, a handle member having a portion threaded into said body andengaging said abrasive element for securing the latter in adjustedposition and a portion projecting laterally from said body.

6. A device for truing a hone comprising a body, a pair of jaws carriedby and projecting laterally from said body and having respectively,laterally concave, open and unobstructed, workengaging surfaces facingin opposite directions and inwardly toward an axis passing mediallyacross and between said jaws, said jaw faces being spaced longitudinallyalong and laterally from said axis, an abrasive element, said bodyhaving a bore longitudinally beyond one of said jaws carrying andguiding said abrasive element for adjustment toward and away from saidaxis in a plane passing through said axis and medially of said faces, ahandle member having a portion threaded into said body and engaging saidabrasive element within said bore for securing said element in adjustedposition and a portion extending perpendicularly to said body.

'7. Apparatus of the class described comprising a bone having a driveshank, a head carried by the shank and longitudinally aligned therewith,and an elongate abrasive surface carried by the head and parallel to thelongitudinal center line thereof, and means for truing said abrasivesurface including a body, a pair of jaws carried by and projectinglaterally from said body and having respectively, laterally concave,open and unobstructed, work-engaging surfaces facing in oppositedirections and inwardly toward an axis passing medially across andbetween said jaws,

said jaw faces being spaced longitudinally along said axis a distancesufiicient to permit said shank to be rocked into position between andengaged by said faces, laterally apart a distance such that said shankis positioned with its center line substantially on said axis, anabrasive element, said body having a portion longitudinally beyond oneof said jaws carrying and guiding said abrasive element for adjustmenttoward and away from said axis, and means carried by said body forsecuring said abrasive element in position to engage the abrasivesurface of the hone.

8. Apparatus of the class described comprising a hone having a driveshank, a head carried by the shank and longitudinally aligned therewith,and an elongate abrasive surface carried by the head and parallel to thelongitudinal center line thereof, and means for truing said abrasivesurface including a body, a pair of jaws carried by and projectinglaterally from said body and having respectively, laterally concave,open and unobstructed, work-engaging surfaces facing in oppositedirections and inwardly toward an axis passing medially across andbetween said jaws, said jaw faces being spaced longitudinally along saidaxis a distance at least as great as the transverse dimension of saidshank and laterally apart a distance substantially equal to thetransverse dimension of said shank, an abrasive element, said bodyhaving a portion longitudinally beyond one of said jaws carrying andguiding said abrasive element for adjustment toward and away from saidaxis, and means carried by said body for securing said abrasive elementin position to engage the abrasive surface of the hone.

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